Derivatives (Details 1) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012 Contract	Jun. 30, 2011	Jun. 30, 2012 Contract	Jun. 30, 2011
Change in the fair value of derivative assets and derivative liabilities attributable to credit risk included in other income
Increase in other income (Loss)	$ 144,000	$ (743,000)	$ 750,000	$ (535,000)
Derivatives (Textual) [Abstract]
Credit risk income			1,000,000
Offset of credit risk			$ 200,000
Number of interest rate swaps	3		3